package homework.api07_2;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class Server {
    private ServerSocket serverSocket;
    List<PrintWriter> p = new ArrayList<>();
    public Server(){
        try {
            serverSocket = new ServerSocket(9997);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void start(){
        try {
            while (true){
                Socket socket = serverSocket.accept();
                ClientHandler clientHandler = new ClientHandler(socket);
                Thread thread = new Thread(clientHandler);
                thread.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;
        private String nickName;
        public ClientHandler(Socket socket){
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }
        public void run(){
            PrintWriter pw = null;
            try {
                InputStream is = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(is, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream os = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(os,StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw,true);
                nickName = br.readLine();
                p.add(pw);
                sendBack("上线了，当前在线人数："+p.size());
                String line;
                while ((line=br.readLine())!=null){
                    System.out.println(line);
                    sendBack(line);
                }
           } catch (IOException e) {}
            finally {
                try {
                    p.remove(pw);
                    sendBack("下线了，当前在线人数："+p.size());
                    socket.close();
                } catch (IOException e) {}
            }
        }
        private void sendBack(String message){
            for (PrintWriter p:p){
                p.println(nickName+"["+host+"]:"+message);
            }
        }
    }
}
